I accidentally ordered two Zwift Rides

Hello, I ordered two Zwift Rides by mistake last night.
Despite emailing the support team directly, I received a shipping confirmation for both bikes the next day.
Unfortunately they are being sent by DPD and I can’t refuse the package online.
What should I do now? How much does it cost to return a Zwift Ride in Germany?

Thanks for your help.

With luck, one will arrive complete and undamaged.